Gram positive bacilli of medical importance are Clostridia,Bacillus species, Listeria and Corynebacteria. Actinomycetes and Nocardia are also gram positive, branching filamentous bacteria, we will be discussing them later on along with Mycobacteria.
Bacteria of the genera Bacillus and Clostridia form endospores that contain dipicolinic acid. The spore is highly resistant to extreme environmental conditions being resistant to heat, freezing, drying and radiation and can exist in the environment for thousands of years or more.
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